Relativity proton beam relative velocity problem

hi guys im new to this forum so this is my first post would appriciete some help with this problem

1. The problem statement, all variables and given/known data
in a colliding beam experiment, in a laboratory frame equal and opposite velocity proton beams collide. the relative velocity of the beams is 2.99 x 10^8 m/s, calculate the magnitude of the velocity of each beam realtive to the lab?

this is all the info i have any guidance on how to approch this would be very useful